This study was conducted to evaluate physiological and psychological effects of visual environments in windowless office spaces. A series of experiments were carried out in an experimental office space. The experimental factors were a window, potted plants and paintings. There were four experimental patterns made up of combination of these factors. The measurements used were electroencephalogram(EEG), finger photoelectric plethysmogram(PTG), heart rate, critical flicker frequency, and subjective appraisals of impression of the visual environments, etc. The results are summarized as follows. 1) These factors especially caused the power of alpha-waves, beta-waves and PTGs to increase. This means that these factors not only make the subjects relaxed but also activate them mentally. 2) Three psychological factors were extracted from the subjective appraisals. "Variety" and "ease" were related to the potted plants and paintings, while "spaciousness" was related to the window. It was demonstrated that these factors create feelings of variety, ease and spaciousness, cause people to relax,and activate them mentally.
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